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एक निकट – दृष्टि दोष वाला व्यक्ति 30 सेमी अधिक दूर की वस्तु को स्पष्ट नहीं देख सकता है। अनन्त पर स्थित वस्तु को देखने के लिए कितनी फोकस – दूरी तथा किस प्रकार के लेन्स की आवश्यतका होगा ।

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30 सेमी फोकस – देरी के अवतल लेन्स की ।

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